High-slip stretch film

Abstract

A multi-layer stretch wrap film has three or more layers, including at least one outer non-cling layer, at least one inner core layer, and at least one outer cling layer, where the film displays enhanced non-cling properties after being stretched.

1 . A multilayer stretch film, comprising:
 at least one slip layer comprising polyethylene and polystyrene;   at least one core layer comprising at least one polyolefin; and   at least one cling layer comprising ultra-low density polyethylene, very low density polyethylene, plastomer, polyisobutylene, linear low density polyethylene, or mixtures thereof.   
     
     
         2 . The film of  claim 1 , wherein the slip layer comprises about polyethylene in about 15%-99% by weight of the slip layer. 
     
     
         3 . The film of  claim 2 , wherein the polyethylene is homopolymer polyethylene, copolymer polyethylene, or mixtures thereof. 
     
     
         4 . The film of  claim 3 , wherein the slip layer comprises homopolymer polyethylene in about 40%-80% by weight of the slip layer. 
     
     
         5 . The film of  claim 4 , wherein the slip layer comprises copolymer polyethylene in about 15%-60% by weight of the slip layer. 
     
     
         6 . The film of  claim 5 , wherein the slip layer comprises polystyrene in about 1%-25% by weight of the slip layer. 
     
     
         7 . The film of  claim 1 , wherein the slip layer further comprises at least one additive selected from the group consisting of color concentrates, slip agents, fillers, specialty additives, and anti-blocking agents in about 0%-99% by weight of the slip layer. 
     
     
         8 . The film of  claim 1 , wherein the polyolefin in the core layer is linear low density polyethylene, low density polyethylene, homopolymer polypropylene, copolymer polypropylene, random copolymer polypropylene, or mixtures thereof. 
     
     
         9 . The film of  claim 8 , wherein the core layer comprises linear low density polyethylene in about 97%-100% by weight of the core layer. 
     
     
         10 . The film of  claim 8 , wherein the core layer comprises low density polyethylene in less than about 3% by weight of the core layer. 
     
     
         11 . The film of  claim 1 , wherein the core layer comprises at least one polyolefin in about 1%-100% by weight of the core layer. 
     
     
         12 . The film of  claim 11 , wherein the core layer comprises a blend of polyethylene and polypropylene. 
     
     
         13 . The film of  claim 11 , wherein the core layer further comprises at least one additive selected from the group consisting of color concentrates, slip agents, fillers, specialty additives, and anti-blocking agents in about 0%-99% by weight of the core layer. 
     
     
         14 . The film of  claim 1 , wherein the cling layer comprises ultra-low density polyethylene in about 1%-100% by weight of the cling layer. 
     
     
         15 . The film of  claim 14 , wherein cling layer comprises ultra-low density polyethylene in about 80% by weight of the cling layer. 
     
     
         16 . The film of  claim 1 , wherein the cling layer comprises plastomer in about 0%-100% by weight. 
     
     
         17 . The film of  claim 16 , wherein the cling layer comprises plastomer in about 70%-100% by weight of the cling layer. 
     
     
         18 . The film of  claim 1 , wherein the cling layer further comprises at least one additive selected from the group consisting of color concentrates, slip agents, anti-blocking agents, fillers, and specialty additives in about 0%-99% by weight of the cling layer. 
     
     
         19 . The film of  claim 1 , wherein the film has a gauge of about 40 gauge-500 gauge. 
     
     
         20 . The film of  claim 1 , wherein the film has a gauge of about 60 gauge-250 gauge. 
     
     
         21 . The film of  claim 1 , wherein the at least one slip layer is about 5%-40% by weight of the film. 
     
     
         22 . The film of  claim 1 , wherein the at least one core layer is about 50%-90% by weight of the film. 
     
     
         23 . The film of  claim 1 , wherein the at least one cling layer is about 5%-40% by weight of the film. 
     
     
         24 . The film of  claim 1 , wherein the slip layer has non-cling properties. 
     
     
         25 . The film of  claim 1 , wherein the cling layer has cling properties. 
     
     
         26 . The film of  claim 1 , wherein a single core layer is disposed between a single first layer and a single third layer. 
     
     
         27 . The film of  claim 26 , wherein the slip layer comprises low density polyethylene in about 70% by weight, linear low density polyethylene in about 20% by weight, and polystyrene in about 10% by weight. 
     
     
         28 . The film of  claim 27 , wherein the core layer comprises linear low density polyethylene in about 100% by weight. 
     
     
         29 . The film of  claim 28 , wherein the cling layer comprises ultra-low density polyethylene in about 80% by weight and linear low density polyethylene in about 20% by weight. 
     
     
         30 . The film of  claim 1 , wherein the film has enhanced non-cling properties after being stretched. 
     
     
         31 . The film of  claim 1  comprising additional layers, wherein each additional layer comprises at least one polyolefin. 
     
     
         32 . The film of  claim 31 , wherein the film has five layers or seven layers. 
     
     
         33 . A multilayer stretch film, comprising:
 at least one slip layer comprising about 70 wt % low density polyethylene, about 20 wt % linear low density polyethylene, and about 10 wt % polystyrene;   at least one core layer comprising about 65 wt % metallocene linear low density polyethylene and about 35 wt % linear low density polyethylene; and   at least one cling layer comprising about 80 wt % ultra-low density polyethylene and about 20 wt % metallocene linear low density polyethylene.